Molding apparatus



Jan. 15, 1924.. 1,480,748

H. L. DEMMLER MOLDING APPARATUS Filed Aug. 16. 1921 2 Sheets-Sheet 1 /Q b b a w'lm lmllllllllllllllmlmil INVENTOR.

Jan. 15, 1924.

7 1,480,748 H. L. 'DEMMLER MOLDING APPARATUS 16 1921 2 Sheets-Sheet 2 Filed Aug.

f Fig. J.

' NVENTOR. I fi y W Patented an. 15, 1924.

UNITED STATES I I .'1,4s0,74"8 PATENT OFFICE."

HENRY n'nmmnnn, or xnwntnn; ILLINOIS.-

MOLDING arrnmrus.

Application filed August 10, 1921. Serial 110. 492,810. I

To all whom it may concern: Be it known that I, HENRY L. DEMMLER, a citizen of the United States, residing at Kewanee, in the county of Henry and State of Illinois, have invented a certain new and useful Improvement in Moldin Apparatus, of which the following is a full, clear, concise, and exact description, reference being had to the accompany ng drawings, forming a' art of this specification.

y invention relates to apparatus to'be used in connection with molding machines of the so-called, Hewlett type in which sand is forced by compressed air from a sand container into a flask or mold. I find that the compressed air used to force the sand into the mold and the atmospheric air in the empty mold combine to retard the proper flow of san into themold and to prevent the proper formation of' the sand therein.

. The principal object of the present invention is to provide for the proper escape of air from the mold or flask in which the 'sand' mold is being formed so that the sand mold will be properly and firmly formed.

In the drawings, I Figure 1 is a vertical sectional View of ap aratusembodying my invention.

, which a cylin pattern plate.

igure 2 is a plan view of a perforated P111173 used in carryih out the invention.

' igure 3 is a sectional view of the plug 1 Figure 4 is aplan view of a pattern plate withpatterns mountedthereon. v

Figure 5 is a plan view of a flaskor mold; Figure dis a planview of asand container. i

Figure 7 is a broken sectional view of the in the operation of the apparatus a flask; '9 is clamped against the sand container 5, the latter being preferably provided with a gasket 10 to seal the joint between the sand container and flask. The flaskp9 'includes a' peripheral wall and one end, preferably the bottom, of the flask isprovided with a plate 11 which is preferably inte Y alwith' theperipheral wall .ofthe flask. he plate 11 1s formed with a plurality of apertures 12. When the apparatus isin operation the'end of the flask which is provided with; I

the plate 11'(illustrated as the bottom). is

sealed-against the sand container 5, while,

the opposite end (illustrated as the top) of the flask clamped against a closure. plate 13. .In the drawing the closure plate 13 is illustrated as removably secured to' the frame 1 and the flask 9 is provided with .dowel pins 16 entering holes in the closure plate 13' in order to center the two relatively to each other. It will be understood, of

course, that the flask 9 may be secured between the sand container and closure plate. in any suitable manner.

The closure plate 13 is provided with a.

plurality of outlet openings in each of which- 15 mserted a plug 15 formed with a plurality of relatively small perforations adapted to prevent the esca e of sand and to permit the escape of air. referably, the closure, plate 13 also constitutes a attern plate andhas any desired pattern or patterns ll'secured to it.

The patterns 14 are also provided with a plurality of openings in which are inserted perforated'plugs 15 similarto those inserted 1n the openings in the-closure; plate. Pref,-

erably, the perforated plugs are made in the form of. brass cups and when inserted in the closure plate and in'the patterns the perforated surfaces of the plugs form part of the moldingsurface of the closure plate and patterns In-operation the sand container 'is first. filled with sand and the piston 3 is then raised pneumatically to clamp theflask between the sand container and the-closure or "pattern plate. Compressed air is then admitted to the sand container below its baflie plate andis distributed through the o emngs therein upwardly against the sand;

-1e inflowing compressed air forces the;

sandupwardly from the container through the openings in the bottom 'of the flask and air escapes freely from the flask through the perforated plugs in the closure plate and in the patterns, thus forming the sand mold compactly, firmly andaccurately. It;

twill beYunderstoodthat the location and size of the openings in the closureflgplate and patterns, and the size of the perforations ,1

in the plugs, will vary in accordance with the form of the flask and patterns and with the sand being used. I prefer to use green sand in the formation of the mold.

Havin 1 thus described my invention,

what I c aim as new and desire to secure by Letters Patent of the United States is 1 The combination of a flask provided at one end with a plate having openings for the admission of sand and'air, and a closure plate for the other end of the flask having openings adapted to permit the escape of air and prevent the escape of sand.

2. The combination of a flask provided at its bottom with a plate having openings for the admission of sand and air, and a closure plate .for the top of the flask having openings adapted to permit the escape of air and its bottom With a plate having openings for the admission of sand and air, a closure plate for the top of the flask having bpening's adapted, to permit the escape of air and prevent the escape of sand, and a pattern mounted on the closure plate.

5. The'combination of a flask provided at its bottom with a plate having openings for the admission of sand and air, a closure plate for the top of the flask, and a pattern mountedon the closure plate, the pattern having openings adapted to permit the escape of air and prevent the escape of sand. Y 6. The combination of a flask provided at its bottom with a plate having openings for the admission of sand and air, a closure plate for the top of the flask, and a pattern 4 mounted on the closure plate, the closure .plate and pattern having openings adapted l I to permit the escape of air and prevent the escape of sand.

7. The combination of a flask provided at its bottom with an integral plate having openings for the admission of sand and air,

, a removable closure plate for the topoof the flask, and a pattern mounted on. the closure plate, the closure plate and pattern having openings adapted to permit the escape of air and prevent the'escape of sand.

8. A molding flask provided at one end with a plate having openings for the admission of sand and air.

9. A molding flask provided at itsbottom with an integral plate having openings for the admission of sand and air.

10. The combination of a flask provided at its bottom with a plate having openings for the admission of sand and air, a closure plate for the top of the flask having apertures therein, and plugs secured in said apertures and formed with a plurality of relatively small perforations.

11. The combination with aflask provided at its bottom with a plate having openings for the admission of sand and air, a closure plate for the top of the flask, a pattern mounted on the closure plate, the closure plate and pattern having apertures therein.

and plugs secured, in said apertures and.

formed with a plurality of relatively small perforations.

12. The combination of a flask provided with an opening for the admission of sand and air, a closure plate for one end of the flask having apertures therein, and plugs secured in the apertures and formed with a plurality of relatively small perforations.

13. The combination of a flask provided with an opening for the admission of sand and air, a closure plate for one end ofthe flask, a pattern mounted on the closure plate having apertures therein, and plugs secured in the apertures and formed with a plurality. of relatively small perforations.

14. The combination of a flask'provided with an opening for the admission of sand and air, a closure plate for one end of the flask, a pattern mounted on the closure plate, the closure plate and pattern having apertures therein, and plugs secured in the apertures and formed with a plurality of relatively small perforations.

HENRY L. DEMMLER. I

Witnesses:

Ror B. Porrmrom E. I. Jormsio st- 

